Tiếng Việt · Idiom Candidate

ba bảy hăm mốt ngày

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Proposed by a contributor, not yet supported by evidence.

Also seen as: ba bảy hai mươi mốt ngày

Meaning · English

Three sevens — twenty-one days: the proverbial shelf life of any new resolve or reformed habit; said with a smirk about changes that won’t stick.

Literally: three times seven, twenty-one days

Examples

Nó thề bỏ thuốc, nhưng chắc lại ba bảy hăm mốt ngày thôi.He swore off cigarettes — give it the proverbial twenty-one days.

Editorial example (batch 058)

Sources & notes

Number-idiom gap probe (2026-08-11); dated idiom, single-source verification today. Definition original.

Common questions

What does “ba bảy hăm mốt ngày” mean?

Three sevens — twenty-one days: the proverbial shelf life of any new resolve or reformed habit; said with a smirk about changes that won’t stick. Literally: three times seven, twenty-one days

Is “ba bảy hăm mốt ngày” formal or informal?

ba bảy hăm mốt ngày is generally informal.

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